Journal
ACS NANO
Volume 4, Issue 8, Pages 4683-4690Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn101196j
Keywords
porous silicon; single-walled carbon nanotubes; tandem structure lithium-ion battery; anode materials; electron beam evaporation
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Funding
- National Science Foundation [CMMI0926093]
- Delaware NASA/EPSCoR RID [NNX07AT51A]
- Natural Science Foundation of China (NSFC) [50828201]
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Development of materials and structures leading to high energy and power density lithium-ion batteries is a major challenge to the power needs of the electronic and automobile industries. Silicon is an attractive anode material being closely scrutinized for use in lithium-ion batteries but suffers from a poor cyclability and early capacity fading. In this work, we present a tandem structure of porous silicon film on single-walled carbon nanotube (SWNT) film to significantly improve the cycling stability of silicon as lithium-ion battery anode material. With this new structure configuration of the silicon films, a reversible specific capacity of 2221 mAh/g was retained after 40 charge-discharge cycles at 0.1 C rate, which is 3.6 times that of silicon film on a regular copper substrate and more than 11 times that of the SWNT film. The facile method is efficient and effective in improving specific capacity and stability of silicon anode lithium-ion batteries and will provide a powerful means for the development of lithium-ion batteries.
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